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Mass, English System of Units
With regard to the English (or British-American) system of units, the pound should be specified either as:
pound mass = lbm (or lbm)
or
pound force = lbf (or lbf)
More specifically, a pound mass can be represented in terms of a slug, where the equivalency is:
1 slug = 32.174 lbm
Now, a slug can be represented in terms of the foot, pound (force), and second:
1 slug = 1
lbf*s2
ft
This means that the relation between lbm and lbf is: